Hoisting-machine.



J. A. BUTTERWORTH. HOISTING MACHINE. APPLICATION FILED SEPT-26. 194. l ifi Patented May 16, 1916.

3 S'HEETSSHEET I.

THE COLUMBIA PLANOGRAPH 0.. WASHINGTON. D. c.

J. A. BUTTERWORTH.

HOISTING MACHINE.

APPLICATION FILED SEPT. 26. 1914.

l ,1 83,4w. Patented May 16, 1916.

3 SHEETS-SHEET 2.

THE COLUMBIA PLANOGRAPH co., WASHINGTON, D. c.

J. A. BUTTERWORTH.

HOISTING MACHINE.

APPLICATION FILED SEPT. 26, 1914,.

3 SHEETS-SHEET 3.

Qzvflmzooeo I W (5. G. Um v Tms wLuMmA PLANOGRAPH c0.. WASHINGTON, D. c.

barman smarts PATEWJF onnron.

JOSEPH ALEXANDER BUTTERWQRTH, 0F LOUGHBOBOUGH, ENGLAND, ASSIGNOR TOHERBERT MORRIS, LIMITED, OF LOUGHBOROUGH, ENGLAND.

HOISTING-MAGHINE.

Specification of Letters Patent.

Patented May 1c, 1916.

To all whom it may concern:

Be it known that I, JOSEPH ALEXANDER BUTTERWORTH, a subject of the Kingof Great Britain, residing at Loughborough, in the county of Leicester,England, have invented certain new and useful Improvements inHoisting-Machines, of which the following is a specification.

This invention relates to hoisting-machines, and particularly to thatclass of machines in which the load is suspended by a rope wound arounda drum, or a chain passing over a sprocket, the drum or sprocket beingturned in the hoisting or lowering direction by a handle, wheel, orother means geared or otherwise connected to the drum or sprocket.

It is desirable in this class of machines to provide: First, that theload shall be efli ciently sustained when hoisted, and yet be capable ofbeing readily lowered by the operating means; second, that it shall bepos sible, when required, to lower the load rapidly under the influenceof gravity;

third, that during such rapid lowering the operating means shall remainstationary; and fourth, that the pull required on the rope or chain tobring the load down shall be as small as possible, so as to permit therapid descent of light loads.

The object of the present invention is the provision of ahoisting-machine having the foregoing qualifications.

An embodiment of the invention is-il1ustrated in the accompanyingdrawings, in which,

Figure 1 is a side elevation of a spur-gear winch, to which theinvention is applied; Fig. 2 is a plan view of the machine,.some of theparts being shown in section; Fig. 3 is a sectional view of thebrake-drum, and the ratchet-and-pawl construction for preventingrotation of thedrum in one direction; and Figs. 4 and 5 are sideelevations of other types of machines having the invention appliedthereto.

As illustrated in Figs. 1 and 2, the machine has a suitablesupporting-frame 1, near the top of which are pivoted to its sides 2, 3,at the points 1, 5, arms or levers 6 and 7, the free ends of theselevers being joined by a suitable connecting-rod 8. Journaled in thelevers 6 and 7, somewhat nearer the pivoted ends than the free ends, isthe spindle 9 of the revoluble drum 10, around which winds theload-carrying rope or chain 11. The drum 10 is provided with a largespur-gear 12 which rotates therewith, and which is arranged to mesh witha smaller spur-gear 13 secured to a shaft 14, which upon the shaft 14:,and this gear is adapted 55 to mesh with a smaller spur-gear 16 securedto and rotatable with a shaft 17 The shaft 17 1s releasably connected,through a suitable clutch, with a handle 18, or any other operatingmeans, one member 19 of the clutch being secured to one end of the shaft17, and the other clutch-member 20 being formed with or connected to theoperating means, and arranged to turn on a suitable journalsleeve 17stationarily mounted about the shaft 17. Disengagement of theclutch-members is eifected by axial movement of the shaft 17 Dependingfrom the connecting-rod 8 of the drum-supporting levers 6 and 7 is abrake-shoe 21, the lower curved surface of which is adapted to rest uponthe periphery of a frictional brake-drum 22 (Fig. 3), fixedly mounted ona sleeve 23 about the shaft 141. The interior face of the brake-drum 22is provided with ratchet-teeth 2 1, and to prevent the turning of thedrum when the operating means is being revolved in the hoistingdirection, pawls 25 pivoted to a carrier-yoke 26 are arranged on theinterior of the drum in position to engage the ratchet-teeth 24, Thepawl-carrier 26 is keyed or otherwise secured 011 the shaft 14:, andconsequently rotates therewith.

The end of the shaft 17 remote from the clutch is journaled in a sleeve27, secured by screws or other means to the side 2 of thesupporting-frame 1, and the outerend 28 of this sleeve is threaded. Nearthe end of the shaft 17 is provided a releasing-lever 29,

having a collar 30. This collar 30 is internally threaded to engage thethreads 28 of the sleeve 27, and its outermost end is apertured in suchmanner as to fit about a reduced or recessed portion 32 of the shaft 17.It will be seen that upon moving the lever 29 up or down, the shaft 17will be moved axially, accordingly. At the end of'the lever 2) remotefrom the handle is a swivel-piece 33 encircling and sliding along thestem 34 of a link 35. On the link 35 there is fixed a collar 36, againstwhich the swivel-piece 33 strikes during the downward movement of thelever 29. The upper end of the link 35 is pivoted at 37 to an arm 38,the latter being secured to one end of and adapted to turn a short-shaft39 rotatably mounted in a bearing formed in an extension of the s de 2of the supporting-frame. To the other end of the short-shaft 39 is fixedan arm 40, the outer end of which is pivoted at 41, through a verticalextension 42, to brake shoe 21. It will be seen that as the shortshaft39 is oscillated, the brake-shoe 21 will be raised from or loweredagainst the surface of the brake-drum 22.

The operation of the machine will be readily understood from theforegoing description. In hoisting, the operating means is turned in theusual manner, and, the clutch-members 19 and 20 being in engagement, theshaft 17 will turn carrying with it the spur-gear 16. Spur-gear 15 andits shaft 14 will be therefore revolved, and the spur-gear 13 will turnthe spur-wheel 12 of the load-carrying drum 10. During this movement ofthe parts, the brake-drum 22 is held stationary, on account of thepressure of the brake-shoe 21 upon its periphcry, and the pawls 25 arepermitted to turn with the pawl-carrier 26 and the shaft 14. The loadwill be maintained in its hoisted position by the frictional engagementof the brake'shoe 21 with the drum 22, the tendency of the shaft 14 toturn in the opposite and lowering direction serving to lock the pawls 25in engagement with the teeth 24 of the brake-drum 22.

To lower the load by hand, the operating means 18 is turned in thelowering direction, when the brake-drum 22 is caused through the mediumof the pawls 25 to turn with the shaft 14. Such turning is effectedagainst the resistance due to the brake shoe 21 pressing on the brakedrum 22; but the system of supportinglevers 6 and 7 is so proportionedand arranged as to require but a reasonably small effort at the handle,for lowering.

To lower the load by gravity, the lever 29 is pushed downward, suchmovement serving first to cause an axial displacement of the shaft 17 todisengage the clutch-members 19 and 20. The operating means will nowremain stationary although the shaft 17 is rotated. When the lever 29has been moved downward sufficiently to disengage the clutch, theswivel-piece 33 strikes the collar 36 on the stem 34, so that furthermovement of the lever 29 causes the lever 38 to move upward therebyturning the shortshaft 39. Arm 40 is thus tilted upward and lifts thebrake-shoe 21 from the brake-drum 22. The load carried by the rope 11will now be free to descend, since the pressure due to thesustaining-brake is relieved. When the lever 29 is released, the weightof the drum 10 combined with the load will cause the brake-shoe 21 toagain assume its position in frictional engagement with the brake-drain22. To reengage the clutchmembers 19 and 20, the lever 29 is furthermoved into its upper position.

In the application of this invention, the necessary pressure on thebrake-drum may be obtained from any suitable member of the machine onwhich there is a pull or pressure induced by or proportional to theload. For example, in the chain-winch illustrated in Fig. 4, the load issuspended by a snatclrblock 43, and the stationary chain 11 is attachedto the lever 6 forming portion of a frame somewhat similar to thatdescribed in connection with Figs. 1 and 2. In such construction.however, the load-supporting drum can be journaled directly in the sidesof the supporting-frame 1. The brake-shoe 21 is caused to press on thebrakedrum 22, as before, and the other details of construction andoperation are the same.

In Fig. 5, the invention is shown as applied to a pulley-block, in whichthe pull in the upper hook 44 is employed to cause, through the lever6", a downward pressure through the brake-shoe 21 on the brakedrum 22.Here again the details of construction and the method of operation areessentially the same as described in connection with Figs. 1 and 2.

I claim 1. In a hoisting-machine, a revoluble loadsupporting member, ashaft mounted to revolve with said member, operating means, aclutch-connection between said load-supporting member and said operatingmeans, a brake-drum on said shaft, a brake-shoe arranged to frictionallyengage the periphcry of said brake-drum, a lever carrying the brakeshoe,means for applying the pull of the load to said lever, means for causingthe rotation of the brake-drum in the lowering direction only, means fordisengaging the clutch, and means for relieving the pressure of saidbrake-shoe on the brake-drum.

2. In a hoisting-machine,a revoluble loadsupporting member, operatingmeans, a shaft adapted to transmit motion from the operating means tosaid load-supporting member, a journal-sleeve on said shaft, abrake-drum on said sleeve, means for causing the rotation of thebrake-drum in the lowering direction only, a brake-shoe arranged tofrictionally engage the periphery of said brake-drum, a lever carryingthe brake-shoe, means for applying the pull of the load to said lever,and means for disengaging said brake-shoe from the brake drum to permitthe load to descend by gravity.

3. In a hoisting-machine, a revoluble load-supporting member, a shaftmounted to revolve with said member, operating means, aclutch-connection between said load-supporting member and said operatingmeans through said shaft, a brake-drum on said shaft, a brake-shoearranged to frictionally engage the periphery of said brakedrum, a levercarrying the brake-shoe, means for applying the pull of the load to saidlever, means for causing the rotation of the brake-drum in the loweringdirection only, and single means for first disengaging the clutch andthen relieving the pres sure of said brake-shoe on the brake-drum.

4. In a hoisting-machine, a revoluble load-supporting member, a shaftmounted to revolve with said member, operating means, aclutch-connection between said load-supporting member and said operatingmeans, one member of said clutch being connected to the operating meansand the other member to said shaft, an intermediate shaft arranged totransmit motion from the first shaft to the load-supporting member, abrake-drum on said intermediate shaft, a brake-shoe arranged tofrictionally engage the periphery of said brake-drum, a lever carryingthe brake-shoe, means for applying the pull of the load to said lever,means for causing the rotation of the brake-drum in the loweringdirection only, and single means for first disengaging said clutchmembers and then relieving the pressure of said brakeshoe on thebrake-drum.

5. In a hoisting-machine, a revoluble load-supporting member, operatingmeans, a shaft adapted to transmit motion from the operating means tosaid load-supporting member, a clutch connecting said operating meansand said shaft, a journal-sleeve on said shaft, a brake drum on saidsleeve, means for causing the rotation of the brakedrum in the loweringdirection only, a brake-shoe arranged to frictionally engage theperiphery of said brake-drum, a lever carrying the brake-shoe, means forapplying the pull of the load to said lever, and means for firstdisengaging said clutch and then disengaging the brake-shoe from saidbrake-drum, to permit the load to descend by gravity.

6. In a hoisting-machine, a revoluble load-supporting member, a shaft, atrain of gears connecting said load-supporting memher and said shaft,operating means, a clutch, one member of said clutch being connected tothe operating means and the other member to said shaft, an intermediateshaft carliving gears of said train, a journal-sleeve stationarilymounted about said interme diate shaft, a brake-drum on said sleevehaving ratchet-teeth, pawls adapted to revolve with said intermediateshaft and to engage said ratchet-teeth only when said operating means isturned in the lowering direction, a brake-shoe arranged to frictionallyengage the periphery of said brakedrum, a lever carrying the brake-shoe,means for applying the pull of the load to said lever, means fordisengaging said clutchmembers, and means for relieving the pres sure ofsaid brake-shoe on the brake-drum. 7. In a hoisting-machine, asupporting frame having two upright sides, a pair of levers each ofwhich is pivoted at one of its ends to one of said sides, aload-supporting drum having journals in said levers between their ends,a shaft, a train of gears connecting said load-supporting drum and saidshaft, operating means, a clutch-connection between said load-supportingdrum and said operating means, one member of said clutch being connectedto the operating means and the other member to said shaft, anintermediate shaft carrying gears of said train, a brake-drum on saidintermediate shaft, a cross-rod connecting the free ends of said levers,a brake-shoe carried by said rod and arranged to frictionally engage theperiphcry of said brake-drum, means for causing the rotation of thebrake-drum in the lowering direction only, and single means for firstdisengaging the clutch and then disengaging said brake-shoe from saiddrum.

8. In a hoistingmachine, a supportingframe having upright sides, a pairof levers each of which is pivoted at one of its ends to one of saidsides, a load-supporting drum having journals in said levers betweentheir ends, a cross-rod connecting the free ends of said levers,operating means for revolving said load-supporting member, a shaftarranged to transmit motion from the operating means to saidload-supporting member, a journal-sleeve on said shaft, a brakedrum onsaid sleeve, a brake-shoe secured to said cross-rod and adapted tofrictionally engage the periphery of said brakedrum, and means forraising said brake-shoe from the brake-drum.

9. In a hoisting-machine, a revoluble load-supporting member, a shaftadapted to transmit motion to said load-supporting member, a stationaryjournal-sleeve on said shaft, a clutch-member on said shaft, op eratingmeans having a clutch-member revoluble about said sleeve, means formoving said shaft axially to disengage said (ar s 192"- 3 1 i Lclutch-members, a brake-drum arranged to of said clutch-members, whenthe load is revolve with said load-supporting member permitted todescend by gravity.

in the lowering direction only, a brake-shoe In testimony whereof Ialfix my signature arranged to frictionally engage the periphin presenceof two witnesses.

ery of said brake-drum, a lever carrying the JOSEPH ALEXANDERBUTTERWORTH.

brake-shoe, means for ap lying the pull of Witnesses: the load to saidlever, an means for reliev- A. W. H. PARNELL, ing said pressure afterthe disengagement R. SrRIGes.

Copies of this patent may be obtained for five cents each, by addressingthe Gommlnioner of I'atutl, Washington, D. 0.

